Hypodermic syringe



Dec. 4, 1923. 1,476,103

F. PLATT ET AL HYPODERMIC SYRINGE Filed :Junei'21. 1922 fig, 2

Fatented Bee, 4, 1%23.

nanran and its train FRANK I. PLATT, GEORGE N. HEIDI, AIID BGBEET B. IMPEY, OF SAN FRANCISCO,

GALIFORNIA.

HYPODERMIC SYBINGE.

Application filed June 21,

To all whom it may concern:

Be it known that we, FRANK L. PLA'r'r, Gnoncn N. Ham, and Ronnn'r R. TMPEY, citizens of the United States, residing at the city and county of San Francisco and State of California, have invented certain new and useful Improvements in Hypodermic Syringes, of which the following is a specification.

This invention relates particularly to hypodermic syringes.

The present type of syringe employs a tapered tip on the barrel or an inwardly tapered opening in the barrel for receiving solely through frictional contact a base mounting for a hypodermic needle, and which base is maintained therein or thereon as the case may be to form a fluid tight oint solely through frictional engagement with the co-operating surface of the barrel. in constructions of this type, the fluid pressure within the barrel often causes a separation of the needle base from the barrel, and a consequent leakage of the fluid and a faulty engagement.

Our present invention relates particularly to a needle base mounting adapted to be held in operative relation at the end of a barrel through a clamping member which with the construction of the barrel discharge opening or bore holds the needle mounting device in fixed position until released.

A further object is to ,rovide a construction wherein the attaching member is positioned in the barrel or casing by being passed longitudinally through the same from its opposite end and held at the-discharge end of the barrel by a clamping member forming a frictional fluid tight joint.

With the above mentioned and other objects in view, the invention consists in the novel construction and combination of parts hereinafter described, illustrated in the accompanying drawings. and set forth in-the claims hereto appended, it being understood that various changes in the form, proportion, size and minor details of construction within the scope of the claims may be resorted to without departing from the spirit or sacrificing any ofthe advantages of the invention.

To more fully comprehend the invention,

1922. Serial No 569,923.

nipple removed from the barrel.

Referring more particularly to the several views of the drawings wherein like characters of reference designate corresponding parts, 1 indicates the barrel of a hypodermic syringe preferably formed of glass, and within which is mounted the usual expelling piston 2. The discharge end of the barrel. is formed with an outwardly tapered bore 3 preferably of conical formation, and within which is adapted to be received the tapered or conical end 4; of the tubular nipple 5 which is inserted in position in the barrel from the end thereof opposite the bore 3. The nipple is formed with a central duct 6, and approximately midway of its length it .is peripherally threaded as at 7 the portion thereof beyond said threaded portion being preferably reduced and of cylindrical form as at 8. The nipple 5 is preferably of metallic construction, and the face of the bore 3 is preferably ground so that contact with the same by the surface of the tapered end 1 of the nipple 5 will form, solely through friction, a fluid tight'joint. A coupling 9 having a threaded end 10 for engaging the thread 7 of the nipple is adapted to be threaded onto said nipple until its end wall 1'1 contacts with the end of the barrel 1 exerting an outward pull on the nipple to maintain the same tightly seated in the bore 3. The outer end'of the nipple is annularly grooved as at 12 surrounding the duct 6 providmg a portlon for receiving a washer 13whichis of a thickness less than the adapter 14, and said needle base at the end V in a depression 17 in the inner end of the i removed from the needle is recessed as at 18 that a metallic tip may be detachably secured to the end of the glass barrel 1 of a hypodermic syringe, and that when positioned it is held from longitudinal movement in either direction until such time as the coupling or holding element is released. This construction provides the separation of the parts for sterilization and provides a syringe which is particularly desirable for physicians use. 7

Having thus described our invention, what we claim as new and desire to protect by Letters Patent oi the United States is 1. A syringe including a barrel'provided with a tubular bore having tapered discharge end, a tubular nipple having a tapered base for detachable reception within said bore by passing the same longitudinally therethrough from the opposite end of said bore, said nipple adapted for frictionally engaging the tapered discharge end or". said bore to provide a fluid tight joint therebetween, a coupler for engaging said nipple and barrel for retaining the same in their relatively operative position, and a needle detachably secured to said coupler. 2. A syringe including a barrel provided .with a tubular, bore having a tapered discharge end, a tubular. nipple having a taperedbase for detachable reception within said boreby passing the same longitudinally therethrough from the opposite end of said bore, said nipple adapted for frictionally engaging the tapered discharge end of said bore to provide a fluid tight joint therebetween, a coupler having threaded connection with said tubular nipple and engaging said barrel for retaining the nipple therein, and a needle detachably associated with the end of said tubular nipple.

3. A syringe including a barrel provided with a tubular bore having a tapered dis- 7 charge end, a tubular nipple having a tapered base for detachable reception within said bore by passing the same longitudibetween, a coupler having threaded connec- 'nally therethrough from the opposite end of tion With said tubular nipple and contact-n ing with said barrel for retaining the nipple therein, a tubular adapter for engaging with said coupler, and a needle extended through the tubular adapter and provided with a base held by said coupler between one end of said nipple and said adapter.

4. A hypodermic syringe including'a bar'- rel provided with a tubular bore formed at one end with a discharge opening of a diameter less than the tubular bore, a nipple having an enlarged end and for detachable reception within said bore by passing the same longitudinally therethrough from the opposite end of said barrehthe enlarged end of said nipple adapted for directly engaging the barrel wall to form therewith a leak proof joint, a coupler for engaging said nipple and said barrel to'retain the parts in their assembled position, and a needle detachably associated with said nipple.

5. A hypodermic syringe including .a barrel provided with a tubular-bore formed at one end with a discharge opening of a diameter less than the tubular bore, a nipple having an enlarged end and for detachable reception within said bore by passing the same longitudinally therethrough from the opposite end of said barrel, theenlarged end of said nipple adapted for directly engaging the barrel wall to form therewith a leak proof joint, a coupler having a threaded connection with said nipple and adapted for forcing into contact with said barrel to exert an outward tension on said nipple to maintain tight its point of contact with said barrel wall, and a needle detachably associated with the nipple and held in position by said coupler.

In testimony whereof we have signed our names to this specification.

FRANK L. PLATTJ. enonen N. nnnv. ROBERT R. IMPEY, 

